Liquid pressure braking means for vehicles



A ril 9, 1935. E, B. BOUGHTON ET AL 1,997,100

LIQUID PRESSURE BRAKING MEANS FOR VEHICLES Filed Aug. 9, 1953 Patented Apr. 9, 1935 UNITED STATES 1,997,100 PATENT OFFICE LIQUID PRESSURE BRAKING MEANS FOR VEHICLES Edward Bishop Bonghton, London, and Geoflrey Yan Vestrant, Leamington Spa, England, assignors to Lockheed Hydraulic Brake Company Limited, London, England Application August 9, 1933, Serial No. 684,446 In Great Britain October 7, 1932 -1Claim.

5 invention having for an object to provide a very simple and inexpensive unit.

According to the invention, a master cylinder and liquidreservoir are constituted each by a metal tube or formed pressing, that comprising the reservoir being larger than that comprising the cylinder, and the latter extending completely through and projecting at each end or side of the reservoir near the lower part thereof.-

According to one form of the invention, which is illustrated in the accompanying drawing in side elevation, a reservoir for pressure liquid is in the form of a drawn metal tube II, which is closed at its lower end by a welded-in metal disc I2 and which has formed at diametrically opposite points in the walls thereof, near to the bottom, two circular holes for receiving a master cylinder II; a bayonet or other cap ll being provided at the open end of the reservoir I I which is to be uppermost. The master cylinder I3 is also comprised by a length of metal tubing, the external diameter of which is equal to that of the two holes formed in the reservoir II. This tube I3 is inserted through the holes in the reservoir II so that it projects, as indicated at I5 and I6, to substantially the same extent at each side of the reservoir I I, and the reservoir II and cylinder I3 are then secured together by welding, as indicated at I! and I8. The master cylinder I3 is formed intermediately of its length with bores I9 and 26 communicating with the interior of the reservoir II and has mounted therein a piston 2| of known type. At one end it is provided with a partial closure 22 serving as an abutment against which the piston 2| may be retracted by the usual return spring (not shown), and this ring-like abutment 22, through which a thrust rod 23 for actuating the piston 2I extends, may be in the form of a divided spring ring, or alternatively may be held in position by a similar device such as that indicated at 24. The other end of the master cylinder I 3 is threaded externally as at 26, to receive a bored screw cap 26 at the outer side ofwhich extends a boss 21 of a diameter slightly smaller than that of the cylinder l3 itself, from which boss 21 in turn extends a threaded nipple 26 to receive the usual union nut (not shown) fcr affixing a pressure conduit of a braking system to the master cylinder I3, said threaded nipple 28, boss 21 and screw cap 26 being formed integrally. The boss 21 just referred to is formed of reduced diameter for a part of' its length, as indicated at 26, to

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provide a shoulder between said reduced portion and the main body of the cap 26. This reduced portion 29 of the boss 21 is formed with a screw thread, which may, if desired, be a continuation of that of the nipple portion 28 of the screw cap 26.

The device comprised by this assembly of master cylinder and liquid reservoir is intended to be mounted in position upon the chassis of a vehicle, by forming in a support member, which may be an actual chassis member, as indicated.

at 30, an aperture to take the above-mentioned shoulder of the screw cap 26, the axial thickness of this shoulder being less than the thickness of this support member 30, so that when the nipple end of the screw cap 26 is inserted through the aperture in the support member 30 until the body of the cap 26 abuts against the support member 30 with the shoulder located within the aperture in the latter, a nut 3| may be screwed onto the threaded reduced part 29 of the boss 21 so that the support member 30 is clamped firmly between it and the main body of the screw cap 26. Then the pressure conduit (not shown) is connected by means of a union nut (not shown) with the threaded nipple portion 28 of the cap 26.

It will be ibserved that a master cylinder and reservoir unit according to the invention will occupy very little space, will be very inexpensive in manufacture, and will be light in weight, requiring little or no special provision in a vehicle for accommodating and supporting it, so that it is particularly adapted for use on motor cars of the smallest types.

What we claim is:

A combined master cylinder and liquid reservoir unit for use in liquid pressure braking means, comprising a tube of comparatively large diameter, a closure for the upper end of the tube, a disk welded to and forming a closure for the lower end of the tube, a second tube of comparatively small diameter extending diametrically through and beyond the tube of large diameter, the second tube being disposed above and immediately adjacent the disk, said second tube in its length within the tube of large diameter being formed with openings to establish communication between the tubes, a piston operative within the second tube, a cap at one end of the second tube, and an extension from the cap for cooperation with a fixture to provide a rigid sole support for the unit, said cap and extension being perforated longitudinally for the passage of fluid therethrough under the action of the piston.

EDWARD BISHOP BOUGHTON. GEOFFREY VAN VESTRAUT. 

